2. Minimize the number of color conversions applied to your files. Set Photoshop to Preserve Embedded Profiles. Always keep your master file in the color space it was created in. Convert only derivative files.

3. Make sure you know about all the color conversions your file goes through. Set Photoshop to alert you whenever a color conversion may take place. Check Ask When Opening / Pasting with Profile Mismatches and Missing Profiles.

Standardize your workflow, using these settings for all your work (with few exceptions).